-Note- I have posted this on both steam forums and another. The post from them is below with modifications as requested -

Hi,

I am just starting out at running a L4D2 server as I was bored, I have this weird bug (Possible feature?) that I would like help sorting out if possible).

The server works fine, installed fine and plays rounds just fine. Absolutely no bugs at all apart from:
When I'm asleep or at college the server has 0 players online. As soon as I login to the server all of the other 3 slots fill up within 10 minutes. Normally instantly.

My question is why is this? I'm assuming once I connect directly the game starts and valve send people via the quick match system. Is it possible to get connections all the time (e.g auto starting or a bot to fill the other slots up?)